include RESTFul and Websocket API
export OK_ACCESS_KEY={your-access-key}
export OK_ACCESS_SECRET={your-access-secret}
export OK_ACCESS_PASSPHRASE={your-passphrase}
make && ./okex balance
# default use USDT
make && ./okex buy PEPE 2000000
# default use USDT
make && ./okex buy --order-type limit --price 0.00000693 PEPE 2000000
# default use USDT
make && ./okex sell PEPE 2000000
# default use USDT
make && ./okex sell --order-type limit --price 0.0000073 PEPE 2000000